Turbomachine rotor blade

Abstract

A turbomachine rotor blade comprising a root ( 14 ) mounted in a channel of the periphery of a disk and held by an annular flange ( 18 ) which presses on the root ( 14 ) of the blade ( 12 ), this root comprising a stop ( 44 ) engaging in a matching cavity of the flange in order to stop it rotating about the axis of the disk, the central portion of the stop having a thickness less than that of the ends of the stop.

1. A turbomachine rotor blade comprising a root having a stop formed in protrusion on one of its upstream and downstream end faces, wherein the central portion of this stop has a thickness in a direction substantially perpendicular to said end face that is less than that of the ends of the stop. 
     
     
       2. The blade as claimed in  claim 1 , wherein the central portion of each stop is lightened by the removal of material. 
     
     
       3. The blade as claimed in  claim 1 , wherein the central portion of each stop is removed by machining. 
     
     
       4. The blade as claimed in  claim 2  or  3 , wherein the lightened or removed central portion of each stop has a length in a direction substantially perpendicular to the longitudinal axis of the blade and parallel to said end face that is at least equal to approximately ¾ or ⅘ of that of the stop. 
     
     
       5. The blade as claimed in  claim 1 , wherein its root has a dovetail or dogtooth shape in cross section. 
     
     
       6. The blade as claimed in  claim 1 , wherein the stop is formed by machining or obtained by casting. 
     
     
       7. A turbomachine rotor disk, comprising blades as claimed in  claim 1  whose roots are mounted in channels of the periphery of the disk, and an annular flange that is mounted coaxially on the disk and that presses on the roots of the blades, the stop of each blade root being engaged in a matching cavity of the flange in order to stop it rotating about the axis of the disk. 
     
     
       8. A turbomachine which comprises at least one rotor disk as claimed in  claim 7 .